Tube-sheet.



No. 784,543. PATENTED MAR. 14, 1905. J. J. BOYCE & J. MOCORMAGK.

-TUBE SHEET.

APPLIOATION FILED MAR. 14, 1904.

` z SHEETS-SHEET 1.

rl 1m q 'iilliilllii -i `|lllllllllllilllllllIlllllllllllli PATBNTED MAR. 14, 1905. J. J. ROYCE .J J. MOCORMAGK.

TUBE SHEET.

APPLIUATION FILED 11.43.14, 1904.

z sHEBTs-SHEET z.

UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

JOHN J. BOYCE AND JOHN MCCORMACK, OF CHICAGO, ILLINOIS; SAID MCCORMACK ASSIGNOR TO SAID BOYCE.

TUBE-SHEET.

SPECIFICATION forming part of Letters Patent No. 784,543, dated March 14, 1905.

Application iled March 14, 1904. Serial No. 198,063.

Be it known that we, JOHNT J. Boron and JonN MCCORMACK, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tube- Sheets, of which the following is a specilication.

Our invention relates to improvements in tube-sheets of steam-boilers, and can be used advantageously either in stationary or locomotive boilers.

One of the objects of our invention is to so construct the tube-sheet as to compensate for any undue strain either of expansion or contraction to which such sheet may be subjected, whether such strain be primarily in the sheet itself or arises through the expansion or contraction of the tubes. v

Another object of our invention is to provide within the boiler an unobstructed body of water along the line of greatest heat.

A further object of our invention is to strength and stiii'en the flue-sheets.

These and such other objects as may hereinafter appear are attained by the devices shown in the accompanying` drawings, in which- Figure l is a back view of a locomotive tube-sheet. Fig. 2 is a sectional view of Fig. l on the line 2 Q of Fig. l looking in the direction indicated by the arrows. Fig. 3 is a sectional view of Fig. l on the line 3 3 of Fig'. l looking in the direction indicated by the a-rrows, and Fig. 4 is a sectional view of Fig. l on the line 4 4 of Fig. l looking in the direction indicated by the arrows.

Like letters of reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying drawings, A represents a tube-sheet of a locomotive-boiler. B represents osets in the tube-sheet. 7; represents the horizontal face of the offset B. C represents the central portion of the offset in the tube-sheet, and c represents the horizontal face of the portion C. l) represents the boiler-tubes. E represents a free space in the boiler unoccupied bytubes.

In the preferred 'form of our invention we provide a free space E within the boiler, which is filled with water and is adjacent to those tubes that receive the greatest amount of heat, thus allowing a greater and more perfect circulation of water about the tubes.

In Fig. 1 we have shown a tube-sheet with offsets therein extending' radially from a common point within the sheet. Obviously, however, our invention is not so limited, as the offsets may extend diagonally across the tubesheet or in any other desired direction.

It is well known that the length of the life of the ordinary tube-sheet and the eficiency of the boiler are in a great measure impaired by reason of the expansion and contraction of the tubes. This expansion and contraction either loosens the connections between the tubes and sheets or Warps and springs the tubesheet. By our invention when any particular tube or set of tubes is caused to expand or contract the strain is transmitted to the tubesheet, which strain instead of causing the sheet to warp and buckle, thus loosening the tubes from their close union with the sheet, is taken care of in the o'set, the horizontal face of which adjusts itself to accommodate the strain.

By the use of our improved sheet we are enabled to form the sheet from metal threeeighths (t) of an inch thick, which will have as much strength and efiiciency as an ordinary {ine-sheet constructed from three-quarter inch metal. This is a considerable saving' in the expense of the metal and is also advantageous because of the reduced weight of the sheet.

Vhile we have shown our invention in its preferred lform and have in a general way suggested some modifications thereof, it will be understood that our invention is not limited to the express embodiment thereof shown or suggested.

1. A tube-sheet having offsets in the face tially rectangular cross-section extending radially from a coi'nrnon point Within the tubesheet. A

6. A tube-sheet having offsets of a substantially rectangular cross-section extending radially from that portion of the tube-sheet which is exposed to the greatest heat.

JOHN J. BOYOE. JOHN MCCORMACK. Witnesses:

F. H. DRURY, G. Y. DANKWARD. 

